Dynamo-electric machine



(No Model.)

F. THONE.

DYNAMO ELECTRIC MACHINE.

No. 405,284. Patented June 18, 1889.

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UNITED STATES PATENT OFFICE.

FRANK THONE, OF OSKALOOSA, IOWA.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 405,284, dated June 18, 1889.

Application filed October 22, 1888- $erial No, 288,736. (No model.)

To aZZ whom it may concern.-

Be it known that I, FRANK THONE, of Oskaloosa, in the county of Mahaska and State of Iowa, have invented certain new and useful Improvements in Dynamo-Electric Generators, of which the following is a specification.

My invention relates to dynamo-electric generators 5 and it consists in a novel-construction of the core of the armature, designed to reduce or suppress the Foucault or eddy current common to many forms of armature, and in a commutator-connection intended to simplify the assembling of the parts of the machine, repairs, the. The invention being confined to these parts, the drawings are likewise restricted thereto;

Figure 1 is a longitudinal central sectional View, and Fig. 2 a transverse sectional'view of the same.

The injurious effects of the eddy-currents are well understood, and many plans have been devised with a view to lessening or suppressing them.

The construction which I have devised is illustrated in the drawings, in which A indicates a drum or cylindercarried by a shaft or arbor B, and duly insulated therefrom, or itself made of non-magn etic and nonconductive material, requiring no special in sulation.

0 indicates the armature-core, and D the bobbins, coils, 0r windings of copper wire, which encompass the core and which are connected with the bars or strips a of the commutator-cylinder E, carried by the shaft in the same general way as heretofore, the details of the connecting devices being, however, of special design, as hereinafter pointed out.

The core consists of two annular heads Z) c, of substantially L shape in cross-section, a series of longitudinal connecting strips or bars (Z, riveted to one of the heads and screwed or bolted to, but carefully insulated from, the other head, as shown in Fig. 1, a series of radial pins d, projecting outward from the bars d, and windings e of iron wire, carried circumferentially around the barrel or body formed by the bars cl and heads I) a, but carefully insulated therefrom, as indicated. The core thus made up is carefully insulated, and is enveloped by a series of windings or coils D of copper wire, properly insulated and wound longitudinally about the hollow cylindrical core, passing inside and outside thereof, as indicated.

The respective coils or windings D have their ends taken out in pairs and connected with the bars or strips 2' of the commutatorcylinder, the means of attachment being optional and constituting no part of the present invention. If the armature is of considerable length, an intermediate hoop or hoops 7c may be applied to the bars (1 at a point or points between their ends, being riveted or otherwise made fast thereto, and serving to stiffen and strengthen the core.

It is obvious that the pins (1' may be omitted, that continuous bands or hoops of metal or other material passing around the core circumferentially may take their place, or that the coils may be merely separated by small strips or blocks of insulating material.

It is also apparent that iron hoops or bands may be substituted for iron wire in the coils or wrappings c.

Having thus described myinventioinwhat I claim is- 1. The armature herein described, consisting of a core and longitudinally-wound coils of copper wire encompassing the same, the core consisting of annular heads or end pieces, longitudinal bars connecting said heads, but electrically insulated from one of them, and circumferential windings or wrappings of iron.

2. The armature-core consisting of heads I) c, longitudinal bars (1, connecting said heads and insulated from one of the same, and circumferential windings or wrappings passing about the cylinder formed of the heads and bars, substantially as shown and described.

8. The armature-core consisting of annular heads I) c, longitudinal bars (1, connecting the heads, but insulated from one of them, pins (1, projecting from said bars, and iron wrappings or windings c, passing between the pins and circumferentially about the series of bars d.

In witness whereof I hereunto set my hand in the presence of two witnesses.

FRANK THONE.

itnesses:

L. A. SCOTT, H. O. TURNER. 

